Therapy, 1928 style. The machine, on display at an X-ray Exhibition in London, was called "The Metalix Tube For Therapy". The famous Metalix tube made by the Philips/Muller Company. Philips (who only started making x-ray tubes in 1922) took over the C.H.F. Muller company in 1927. The innovative feature of the tube was the fact that the body (the canister) was a stainless steel cylinder fused at each end to glass tubes that held the anode and cathode. It was developed in the mid 1920s by A. Bouwers while working for Philips. Bouwers was the same individual who was primarily responsible for developing the first working x-ray tube with a rotating anode in 1929.